<template>
  <div class="com-container">
    <div class="com-chart" ref="stock_ref"></div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
import { stockData } from "@/api/index";
export default {
  data() {
    return {
      chartInstance: null,
      allData: null,
      currentIndex: 0,
      timerId: null
    };
  },
  mounted() {
    this.initChart();
    this.getData();
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter()
  },
  destroyed() {
    window.removeEventListener("resize", this.screenAdapter);
    clearInterval(this.timerId)
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.stock_ref, this.theme);
      const initOption = {
        title: {
          text: "▎库存和销量分析",
          left: 20,
          top: 20,
        },
      }
      this.chartInstance.setOption(initOption);
      this.chartInstance.on('mouseover', () => {
        clearInterval(this.timerId)
      })
      this.chartInstance.on('mouseout', () => {
        this.startInterval()
      })
    },
    async getData() {
      // 获取服务器的数据, 对this.allData进行赋值之后, 调用updateChart方法更新图表
      try {
        let result = await stockData();
        this.allData = result
        this.updateChart();
        this.startInterval()
      } catch (e) {
        console.log(e);
      }
    },
    updateChart() {
      const centerArr = [
        ['18%', '40%'],
        ['50%', '40%'],
        ['82%', '40%'],
        ['34%', '75%'],
        ['66%', '75%']
      ]
      const colorArr = [
        ['#4FF778', '#0BA82C'],
        ['#E5DD45', '#E8B11C'],
        ['#E8821C', '#E55445'],
        ['#5052EE', '#AB6EE5'],
        ['#23E5E5', '#2E72BF']
      ]
      const start = this.currentIndex * 5
      const end = (this.currentIndex + 1) * 5
      const showData = this.allData.slice(start, end)
      const seriesArr = showData.map((item, index) => {
        return {
          type: 'pie',
          // radius: [110, 95],//内园半径，外圆半径
          center: centerArr[index],
          hoverAnimation: false,//关闭鼠标移入时关闭动画效果
          labelLine: {
            show: false,//隐藏指示线
          },
          label: {
            position: 'center',
            color: colorArr[index][0]
          },
          data: [
            {
              name: item.name + '\n' + item.sales,
              value: item.sales,
              itemStyle: {
                color: new this.$echarts.graphic.LinearGradient(0, 1, 0, 0, [
                  {
                    offset: 0,
                    color: colorArr[index][0]
                  }, {
                    offset: 1,
                    color: colorArr[index][1]
                  }
                ])
              },
            }, {
              value: item.stock,
              itemStyle: {
                color: '#333843'
              }
            }
          ]
        }
      })
      const dataOption = {
        series: seriesArr
      };
      this.chartInstance.setOption(dataOption);
    },
    screenAdapter() {
      const titleFontSize = (this.$refs.stock_ref.offsetWidth / 100) * 3.6;
      const innerRadius = titleFontSize * 2.8
      const outtrRadius = titleFontSize * 2
      const adapterOption = {
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        series: [
          {
            type: 'pie',
            radius: [outtrRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outtrRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outtrRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outtrRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
          {
            type: 'pie',
            radius: [outtrRadius, innerRadius],
            label: {
              fontSize: titleFontSize / 2
            }
          },
        ]
      };
      this.chartInstance.setOption(adapterOption);
      this.chartInstance.resize();
    },
    startInterval() {
      if (this.timerId) {
        clearInterval(this.timerId)
      }
      this.timerId = setInterval(() => {
        this.currentIndex++
        if (this.currentIndex > 1) {
          this.currentIndex = 0
        }
        this.updateChart()//在更改完currentIndex之后
      }, 2500);
    }
  },
  computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme() {
      this.chartInstance.dispose()//销毁当前的图标
      this.initChart()//重新初始化图标
      this.screenAdapter()//完成屏幕适配
      this.updateChart()//更新图标展示
    }
  }
};
</script>

<style lang='less' scoped>

</style>
